JPH0262333A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To cut cost with simplification of the structure by having an oscillating arm oscillated by the reverse rotation of a drive motor, and by having a sheet feeding roller contacted with and separated from a form. CONSTITUTION:Pickup rollers 39, 39 are attached to the points of oscillating arms 40, 40, and are connected to each other through a shaft 41. Basic parts of the arms 40, 40 are pivotally supported by a shaft 42, and the shafts 41 and 42 are linked one another through a power transmission belt 43. An edge of the shaft 42 is connected to a reverse-rotating drive motor 48 through gears 44, 45, 46 and a drive belt 47. Since, having the oscillating arms 40, 40 oscillated, and pickup rollers 39, 39 contacted with and separated from a form by means of the reverse rotation of the drive motor 48, the structure can be simplified compared to the case where a solenoid mechanism is used, and the cost can thus be cut.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a paper feeding device applied to, for example, an electronic copying machine.

(Prior Art) Some electronic copying machines are capable of double-sided copying or overlapping copying.

This type of electronic copying machine is equipped with a paper feeding unit at the bottom of the copying machine main body, and the paper on which the image has been transferred by the photosensitive drum inside the copying machine main body is guided into the paper feeding unit and accumulated in the stacking section. Thereafter, the sheets are sent again from this stacking section to the photosensitive drum in the main body of the copying machine for overlapping copying or double-sided copying.

By the way, the paper stacked in the stacking section is sent out by rotation of a paper feed roller. The paper feed roller is provided so as to be movable in a direction toward and away from the stacking section, and when introducing paper into the stacking section, it is moved in a direction away from the stacking section so as not to interfere with the paper. After stacking the paper, the paper feed roller is moved toward the paper and brought into contact with the paper to send out the paper.

(Problem to be Solved by the Invention) However, in the past, a solenoid was connected to the paper feed roller through an arm and a link mechanism, and the paper feed roller was moved using the difference in stroke of this solenoid. , it becomes structurally complex and costly, and requires means for adjusting the stroke of the solenoid.
Adjustment work was also troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a paper feeding device that can move a paper feeding roller with a simple configuration without using a solenoid. It is.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a device for taking out and feeding paper stacked in a stacking section, which includes a drive motor that rotates in forward and reverse directions; , a swinging arm that swings and is connected to the drive motor via a spring clutch mechanism whose position can be controlled in either forward or reverse rotational directions, and a swinging arm that is provided at the swinging end of the swinging arm. The apparatus is characterized by comprising a paper feed roller that is moved in a direction towards and away from the paper in the stacking section by the swinging of the paper.

(Function) With the above means, the paper feed roller can be moved without requiring a complicated mechanism.

(Example) The present invention will be described below with reference to an example shown in the drawings.

FIG. 2 shows an electronic copying machine, in which a copying machine main body 1 is placed on the top surface of a paper feed unit 2 that includes a paper reversing mechanism. A document placement table 3 is provided on the upper surface of the copying machine main body 1, and an automatic document feeder 4 is provided on the document placement table 3. The automatic document feeder 4 includes a document setting section 5a, a document take-out section 5b, a document reversing section 6, and a document transport section 7.

A photosensitive drum 8 is provided in the copying machine main body 1, and around the photosensitive drum 8, a charging charger 9, a developing device 10, a transfer charger, a peeling charger 11, 12, and a cleaning charger are arranged along the rotation direction. A device 13 is provided.

Further, an optical system 14 is provided in the copying machine main body 1,
This optical system 14 is composed of an exposure lamp 15, first to third mirrors 16, 17, 18, lens 19, and fourth to sixth mirrors 20, 21, 22.

Further, upper and lower paper feed cassettes 23.24 are detachably attached to one side of the copying machine main body 1, and sheets taken out from these paper feed cassettes 23.24 are conveyed along a conveyance path 25. It has become so.

The conveyance path 25 is provided with a registration roller 26, the transfer/separation charger 11, 12, a conveyance belt 27, a fixing device 28, a paper discharge roller 29, a switching gate 32, and a discharge port 30 along the paper conveyance direction. It is being A discharge tray 31 is attached to the downstream side of the discharge a-ra 30.

Next, the paper feeding unit 2 will be described in detail with reference to FIG. 3.

A stacking section 36 is provided in the paper feeding unit 2 in an inclined manner. This accumulation section 36 is connected to the switching gate 32 side in the copying machine main body 1 via an 8 o'clock conveyance path 37.

Furthermore, this stacking section 36 is connected to the registration roller 26 side in the copying machine main body 1 via a vertical conveyance path 38.

On the other hand, pick-up rollers 39, 39 as paper feed rollers are provided on the upper side of the stacking section 36. These pickup rollers 39, 39 are attached to the tips of swing arms 40, 40, and are connected via a shaft 41, as shown in FIG. Also,
The base ends of the arms 40, 40 are rotatably supported by a shaft 42, and the shafts 41 and 42 are connected via a power transmission belt 43.

Also, one end of the shaft 42 is connected to a gear 4445.46.
It is connected via a drive belt 47 to a drive motor 48 that rotates in forward and reverse directions. Furthermore, gears 49 and 50 are attached to the middle part of the shaft 42, and these gears 49 and 50
．． 50 are connected via a gear 57, a shaft 52, and a gear 53. The gear 50 has a gear 56.
are engaged with each other, and the spring clutch mechanism 5 is connected to this gear 56.
A sheet metal 62 is connected via 4. The spring clutch mechanism 54 is constructed as shown in FIG. That is, 55 in the figure is a shaft, and this shaft 55
includes the gear 56, the arm 51, and the first spring 58.
, an arm 59, a second spring 60, and an arm 61 that is an L-shaped arm 61a.

The first and second springs 58 and 60 are formed to have reverse windings, and the idling surfaces due to the frictional force against the arms 57 and 59 are different depending on the forward and reverse rotations, and the position can be controlled for rotation in either the forward or reverse directions. It looks like this.

The metal plate 62 is rotatably attached to the shaft 42, and when the arm 61a rotates counterclockwise, the metal plate 62 contacts and rotates, and also contacts the swing arm 40. The swing arm 40 is rotated counterclockwise in contact with the swing arm 40.

Furthermore, when the arm 61a is rotated clockwise, the sheet metal 6
The stroke is made so as to come into contact with the notch 63a of No. 3 and stop.

A switchback section 65 is formed on the right side of the stacking section 36 in FIG. 2, and the paper P is fed in and reversed by the switching operation of the gate 66 during overlapping copying.

During normal copying, the automatic feeder 4 feeds the document to the document placement table 3, and the exposure lamp 1
5, the original is irradiated with light, and the reflected light is transmitted to the photosensitive drum 8 via the first to third mirrors 16, 17, 18, lenses 19, and fourth to sixth mirrors 20, 21, 22.
is irradiated.

The surface of the photosensitive drum 8 is uniformly charged by a charging charger 18, and an electrostatic latent image is formed.

This electrostatic latent image is developed by supplying developer with the developing device 10.

On the other hand, at this time, paper is sent out from the paper feed cassette 23 or 24, and the photosensitive drum 8 and transfer charger 11
The image is transferred between the two. After this image is transferred, the paper is peeled off from the photosensitive drum 8 by the action of the peeling charger 12. The peeled paper is sent to the fixing device 28 via the conveyance belt 27, and after the image is fixed thereon, it is ejected to the paper ejection tray 31 via the paper ejection roller 29 and the ejection roller 30.

Next, the case of double-sided copying or overlapping copying will be explained.

At this time, the switching gate 32 on the paper ejection roller 29 side rotates upward, and the paper on which the image has been transferred is sent inside the paper feed unit 2 via the figure 8 conveyance path 37 and introduced into the stacking section 39 to be stacked. Ru. When stacking this paper, the drive motor 48
is rotated in the opposite direction, and the drive belt 47, gears 46, 45.44
, 49.51 shaft 52, gear 53. Gear 50. The arm 61a of the arm 61 is rotated counterclockwise via the gear 56 and the spring clutch mechanism 54.

This rotation causes the arm 61a of the arm 61 to move toward the sheet metal 62.
The metal plate 62 is rotated counterclockwise together with the arm 61a. This sheet metal 62 is attached to the swing arm 40.
The swinging arm 40 rotates counterclockwise, and the swinging arm 40 comes into contact with the sheet metal 63 and stops. This results in
The pickup rollers 39, 39 are raised and retracted from the stacking section 36 as shown in FIG. 5, so that they do not interfere with the sheets P introduced into the stacking section 36.

In addition, after finishing stacking the paper P, the drive motor 48
is rotated forward and the drive belt 47 gear 46°45.44,4
9.51, shaft 52, gear 53, gear 50. gear 5
6 and the arm 6 via the spring clutch mechanism 54.
The first arm 61a is rotated clockwise. This rotation causes the arm 61a of the arm 61 to move toward the notch 6 of the sheet metal 63.
When it comes into contact with 3a and stops, as shown in Figure 6,
Pick-up roller of swing arm 40.40 39°39
falls freely to the stacking section 36 and presses against the paper P with its own weight. At this time, the pickup rollers 39 and 39 are rotated by the power transmission belt 43 that is driven by the rotation of the shaft 42, and send out the paper P in the stacking section 36. During double-sided copying, this fed paper P is not sent to the switchback section 65, but is sent as it is to the registration roller 26 side in the copying machine main body 1 via the vertical conveyance path 38, and is transferred to the photosensitive drum 8 and the transfer charger 11. A double-sided copy is sent between the two.

Further, during overlapping copying, the sheets P sent out from the stacking section 26 are sent to the switchback section 65 and reversed, and then sent between the photosensitive drum 8 and the transfer charger 11 for overlapping transfer.

As described above, the forward and reverse rotation of the drive motor 48 causes the swinging arm 40.40 to swing and move the big-a-umbrella 39.39 toward and away from the paper P, compared to the case where a solenoid mechanism is used. The configuration can be simplified and costs can be reduced.

Further, since the pickup rollers 39, 39 are caused to fall freely and come into contact with the paper P in the stacking section 36, stroke adjustment of the pickup rollers 39, 39 is not necessary.

Furthermore, since the pickup rollers 39,39 are moved by the swinging of the swinging arms 40,40, the stroke can be made sufficiently large.

Note that the present invention is not limited to the above embodiment, and may be applied to the pickup roller 4a of the automatic document feeder 4, or the pickup roller 23 of the paper feed cassette 23.24.
a, 24a.

[Effects of the Invention] As explained above, according to the present invention, a solenoid mechanism is used to swing the swinging arm and move the paper feed roller toward and away from the paper by the forward and reverse rotation of the drive motor. The configuration can be simplified and costs can be reduced compared to the conventional case.

Furthermore, since the paper feed roller is brought into contact with the paper in the stacking section by falling freely, there is no need to adjust the stroke of the paper feed roller.

Furthermore, since the paper feeding roller is moved by the swinging of the swinging arm, there is an effect that the stroke can be made sufficiently large.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram showing a spring clutch mechanism, FIG. 2 is a schematic block diagram showing an electronic copying machine, and FIG. 3 is a block diagram showing a paper feeding unit. , FIG. 4 is a block diagram showing the drive mechanism of the paper feed roller, and FIGS. 5 and 6 are explanatory diagrams showing the movement of the paper feed roller. 36... Accumulating unit, 39... Pick up roller (paper feed roller), 40... Swinging arm, 48... Drive motor, 54... Spring clutch mechanism. Figure 1 Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] A device that takes out and feeds paper stacked in a stacking section includes a drive motor that rotates in forward and reverse directions, a spring clutch mechanism that can control the position of this drive motor in either the forward or reverse direction of rotation, and this spring clutch. A swinging arm that is connected via a mechanism and swings; and a supply that is provided at the swinging end of the swinging arm and is moved toward and away from the paper in the stacking section by the swinging of the swinging arm. A paper feeding device comprising a paper roller.